JP2021066036A - Injection molding machine and industry mechanical control device - Google Patents

Abstract

To provide an injection molding machine that reduces the possibility of an operator to touch a control panel with residual voltage, and an industry mechanical control device.SOLUTION: An injection molding machine 10 has a control panel 18 that controls the injection molding machine 10, a storage part 38 that includes an opening 40 and stores the control panel 18, a cover 20 that covers the opening 40, and a lock mechanism 22 that locks the cover 20 covering the opening 40 and releases the lock when the voltage of the control panel 18 falls below a predetermined voltage value.SELECTED DRAWING: Figure 1

Description

The present invention relates to a control device for an injection molding machine and an industrial machine.

Patent Document 1 discloses an injection molding machine including a base and a control panel housed in the base. According to the disclosure, the control panel housed in the base is covered with a cover plate that can be opened and closed, and it is necessary to open the cover plate when working on the control panel.

Jitsuzenpei 02-065519

The work of removing the cover plate can be performed by the operator based on his / her own judgment regardless of the energized state of the control panel. Therefore, even when the voltage remains in the control panel, the operator can remove the cover plate and come into contact with the control panel.

Therefore, an object of the present invention is to provide a control device for an injection molding machine and an industrial machine that reduces the risk of an operator coming into contact with a control panel in which a voltage remains.

One aspect of the invention is an injection molding machine, wherein a control panel for controlling the injection molding machine, an accommodating portion provided with an opening for accommodating the control panel, a cover covering the opening, and the like. A lock mechanism for locking the cover covering the opening and releasing the lock when the voltage of the control panel becomes equal to or lower than a predetermined voltage value is provided.

Another aspect of the invention is a control device for an industrial machine, which includes a control panel for controlling the industrial machine, a housing provided with an opening and accommodating the control panel, and a cover covering the opening. A lock mechanism for locking the cover covering the opening and releasing the lock when the voltage of the control panel becomes equal to or lower than a predetermined voltage value is provided.

According to the present invention, there is provided a control device for an injection molding machine and an industrial machine that reduces the risk of an operator coming into contact with a control panel in which a voltage remains.

It is a side view of the injection molding machine of 1st Embodiment. It is a circuit diagram of the electric circuit of 1st Embodiment. It is a figure for demonstrating operation of a lock mechanism. It is a circuit diagram of the electric circuit of the modification 1-1. It is a circuit diagram of the electric circuit of the modification 1-2. It is a front view of the control device of the industrial machine of the 2nd Embodiment. It is a circuit diagram of the electric circuit of the 2nd Embodiment.

Hereinafter, preferred embodiments of the injection molding machine and the control device for the industrial machine according to the present invention will be described in detail with reference to the accompanying drawings. In addition, each direction described below shall follow the arrow shown in each drawing.

[First Embodiment]
FIG. 1 is a side view of the injection molding machine 10 of the first embodiment.

The injection molding machine 10 includes an injection mechanism unit 12, a mold clamping mechanism unit 14, a base 16, a control panel 18, a cover 20, and a lock mechanism 22. The portion shown by the broken line in FIG. 1 means that it is on the other side of the cover 20 from the viewpoint of FIG.

The injection mechanism unit 12 includes a tubular cylinder 24, a screw 25 provided in the cylinder 24, a nozzle 26 provided at the tip of the cylinder 24, and a drive device 28. The injection mechanism 12 plasticizes and weighs the molding material in the cylinder 24 by rotating and retracting the screw 25. Further, by advancing the screw 25, the molding material is ejected from the nozzle 26. The drive device 28 is a device that rotates and advances the screw 25. The drive device 28 includes a motor M1 for moving the screw 25 forward and backward, and a motor M2 for rotating the screw 25.

The mold clamping mechanism portion 14 includes a mold 30 and an opening / closing mechanism 31. The mold 30 has a movable mold 30a, a fixed mold 30b, and a pin 30c. In the mold 30, the movable mold 30a moves in the front-rear direction with respect to the fixed mold 30b. The state in which the movable mold 30a and the fixed mold 30b are in contact with each other is the closed state of the mold 30, and the state in which the mold 30 is separated is the open state. The opening / closing mechanism 31 includes a motor M3. When the motor M3 is driven, the movable mold 30a moves with respect to the fixed mold 30b. The molding material is injected into the mold 30 from the nozzle 26.

The mold clamping mechanism portion 14 manufactures a molded product by solidifying the molding material injected into the mold 30. The molded product is projected by the opening / closing mechanism 31 opening the mold 30 and then projecting with the pin 30c. In connection with this, the mold clamping mechanism portion 14 further includes a motor M4 for realizing the ejection operation of the pin 30c.

Among the above, as the motor M1, the motor M2, the motor M3, and the motor M4, an AC motor M driven by an AC voltage can be adopted. The injection molding machine 10 may appropriately include an AC motor M other than the motors M1 to M4, if necessary.

The base 16 includes an upper frame 32, a support column 34, and a lower frame 36. The upper frame 32 is a member extending in the front-rear direction, and supports at least one of the injection mechanism portion 12 and the mold clamping mechanism portion 14 from below. The support column 34 is a member extending in the vertical direction and supports the upper frame 32 from below. A plurality of columns 34 are provided as needed. The lower frame 36 is a member extending in the front-rear direction, and supports the support column 34 from below.

Further, the base 16 constitutes the accommodating portion 38. That is, the base 16 has a space below the upper frame 32 (injection mechanism portion 12 and mold clamping mechanism portion 14). In the present embodiment, this space is partitioned by a flat plate or the like to be utilized as the accommodating portion 38. The accommodating portion 38 has an opening 40 through which the inside and outside pass.

The control panel 18 is accommodated in the accommodating portion 38. The operator may come into contact with the control panel 18 through the opening 40. In the present embodiment, since the control panel 18 is accommodated in the accommodating portion 38 formed by the base 16, when the injection molding machine 10 is to be installed, the space for installing the control panel 18 is separately provided from the base 16. There is no need to secure it. The control panel 18 is provided with a control circuit 44 (FIG. 2) that controls the drive of the AC motor M by energizing the control panel 18.

The cover 20 is a member that covers the opening 40. The cover 20 covers the opening 40 to prevent the operator from coming into contact with the control panel 18 except when necessary. The material and shape of the cover 20 are not particularly limited, but in the present embodiment, the material includes metal and the shape is plate-like.

The lock mechanism 22 is a mechanism that keeps the cover 20 in a state of covering the opening 40. In the present embodiment, maintaining the cover 20 in a state of covering the opening 40 is also referred to as “locking”. Locking makes it difficult to remove the cover 20 from the opening 40. The lock mechanism 22 of the present embodiment locks when the voltage (DC voltage) of the control panel 18 exceeds a predetermined voltage value Vth, and releases the lock when the voltage becomes equal to or less than a predetermined voltage value Vth. Here, those skilled in the art use a voltage value equal to or less than the voltage value (60 volts) required for ensuring the safety of workers in, for example, the international standard for machine safety (IEC-60204-1) as a predetermined voltage value Vth. Can be decided. Such a lock mechanism 22 is realized by, for example, a solenoid type electromagnetic lock.

The mechanism of locking by a solenoid-type electromagnetic lock is known in itself, but will be briefly described here. The solenoid-type electromagnetic lock has a first member (main body) provided in the accommodating portion 38 and a second member (lock plate) provided in the cover 20. The first member is provided, for example, on the edge of the opening 40 of the accommodating portion 38, and the first member and the second member come into contact with each other when the cover 20 covers the opening 40. Further, the first member has a solenoid (DC solenoid). The solenoid has a conducting wire that generates a magnetic field when energized, a movable iron core, and a fixed iron core. The movable core is attracted to the fixed core while the conducting wire is generating a magnetic field, and is separated from the fixed core while the magnetic field is not generated. Further, when the movable iron core is sucked into the fixed iron core, the movable iron core or the member connected to the movable iron core is fitted to the second member to fix the second member. As a result, the contact between the first member and the second member is maintained while the solenoid conducting wire is energized. That is, by supplying a voltage to the solenoid, the state in which the cover 20 covers the opening 40 is maintained.

FIG. 2 is a circuit diagram of the electric circuit 42 of the first embodiment.

In the present embodiment, a voltage is supplied from the control panel 18 to the lock mechanism 22. In order to realize this, in the present embodiment, by configuring the electric circuit 42 shown in FIG. 2 in the injection molding machine 10, the control circuit 44 provided in the control panel 18 and the lock mechanism 22 are electrically connected. ..

Hereinafter, the configuration of the electric circuit 42 shown in FIG. 2 will be described. The electric circuit 42 includes a control circuit 44 provided on the control panel 18, and a connection circuit 46 for electrically connecting the control circuit 44 (control panel 18) and the lock mechanism 22. “P” in FIG. 2 indicates an AC power supply. The power supply P can be switched on and off. “M” in FIG. 2 indicates a control target of the control circuit 44. The control target (M) of the control circuit 44 is the AC motors M (M1 to M4) in the present embodiment.

The control circuit 44 drives the AC motor M by supplying the drive voltage VAC2 to the controlled object. Although omitted in FIG. 2, a plurality of control targets (M) may be connected to the control circuit 44. The control circuit 44 includes a first converter 48, a first wire 50, a second wire 52, an inverter 54, and a capacitor 56.

The first converter 48 is an AC / DC converter. The first converter 48 is connected to the power supply P and converts the voltage VAC1 supplied from the power supply P into a DC voltage (first DC voltage) VDC1.

The capacitor 56 smoothes the first DC voltage VDC1. At that time, the capacitor 56 stores electricity.

The inverter 54 converts the first DC voltage VDC1 smoothed by the capacitor 56 into a drive voltage (second AC voltage) VAC2. This drive voltage VAC2 is supplied to the AC motor M. As a result, the AC motor M is driven. When there are a plurality of AC motors M, the control circuit 44 is provided with a number of inverters 54 corresponding to the number of the plurality of AC motors M.

The first converter 48 and the inverter 54 are connected to each other by the first wire 50 and the second wire 52. Further, the capacitor 56 is connected between the first wire 50 and the second wire 52. Both the first line 50 and the second line 52 are conducting wires. In the present embodiment, the first line 50 is the positive electrode line and the second line 52 is the negative electrode line.

Next, the connection circuit 46 will be described. The connection circuit 46 is a circuit that can be provided on the control panel 18 together with the control circuit 44, and is a circuit that electrically connects the control circuit 44 and the lock mechanism 22. The connection circuit 46 includes a third wire 58, a fourth wire 60, a second converter 62, a resistance element 64, and a rectifying element 66.

The third wire 58 and the fourth wire 60 are both conducting wires. Of these, one end of the third wire 58 is connected between the first converter 48 and the capacitor 56 in the first wire 50, and the other end is connected to the second converter 62. One end of the fourth wire 60 is connected between the first converter 48 and the capacitor 56 in the second wire 52, and the other end is connected to the second converter 62.

A resistance element 64 is inserted in series with the third wire 58. This prevents an excessive current from flowing through the connection circuit 46.

The rectifying element 66 is a Zener diode. The anode of the rectifying element 66 is connected between the resistance element 64 in the third wire 58 and the second converter 62. Further, the cathode of the rectifying element 66 is connected to the fourth wire 60. As a result, the first DC voltage VDC1 supplied to the second converter 62 is stabilized.

The second converter 62 is a DC / DC converter. The second converter 62 is for stably supplying the lock mechanism 22 with the voltage required for the lock mechanism 22 to execute the lock. That is, when the first DC voltage VDC1 supplied to itself exceeds the predetermined voltage value Vth, the second converter 62 converts the first DC voltage VDC1 into the second DC voltage VDC2. To do. As a result, the lock mechanism 22 is supplied with the second DC voltage VDC2 instead of the first DC voltage VDC1. The voltage value of the second DC voltage VDC2 is smaller than the voltage value of the first DC voltage VDC1 (VDC2 <VDC1). The above is the circuit configuration of the electric circuit 42.

In the above electric circuit 42, when the power supply P is turned on, the lock mechanism 22 executes the lock by the second DC voltage VDC2 supplied to itself. Further, after the power supply P is turned off, the capacitor 56, which has been storing electricity until then, starts discharging. By this discharge, the first DC voltage VDC1 exceeding a predetermined voltage value Vth is supplied from the capacitor 56 to the second converter 62. At this time as well, since the second DC voltage VDC2 is supplied to the lock mechanism 22, the lock is still continued.

FIG. 3 is a diagram for explaining the operation of the lock mechanism 22. The vertical axis (V) of FIG. 3 indicates the first DC voltage VDC1, and the horizontal axis (t) indicates time. t = 0 indicates a time point at which the first DC voltage VDC1 begins to drop after the power supply P is turned off.

After that, as the capacitor 56 continues to discharge, the first DC voltage VDC1 supplied to the second converter 62 begins to decrease (t = 0). The decreasing first DC voltage VDC1 eventually reaches a predetermined voltage value Vth. When the first DC voltage VDC1 becomes equal to or lower than the predetermined voltage value Vth, the second converter 62 cannot supply the second DC voltage VDC2 to the lock mechanism 22. When the second DC voltage VDC2 is no longer supplied, the lock mechanism 22 cannot maintain the lock. As a result, the lock is released.

As described above, in the present embodiment, the lock by the lock mechanism 22 is not released unless the voltage of the control panel 18 drops to such an extent that the second converter 62 cannot convert the voltage. Therefore, according to the present embodiment, there is provided an injection molding machine 10 that reduces the risk of an operator coming into contact with the control panel 18 in which the voltage remains.

[Modification example]
Although the first embodiment has been described above as an example of the present invention, it goes without saying that various changes or improvements can be made to the first embodiment. It is clear from the description of the claims that such modified or improved forms may also be included in the technical scope of the present invention.

(Modification 1-1)
FIG. 4 is a circuit diagram of the electric circuit 42 of the modified example 1-1.

The injection molding machine 10 may include a voltage monitoring unit 68 instead of the second converter 62. The voltage monitoring unit 68 sequentially detects the magnitude of the first DC voltage VDC1 from the control circuit 44, and when the detected first DC voltage VDC1 is equal to or less than a predetermined voltage value Vth, the lock mechanism 22 determines the magnitude of the first DC voltage VDC1. Send a signal. Hereinafter, this predetermined signal is also referred to as a release signal.

As a result, as in the first embodiment, the possibility that the operator comes into contact with the control panel 18 in which the voltage remains is reduced.

The release signal is, for example, a Low signal among digital signals. The voltage monitoring unit 68 transmits a High signal among the digital signals to the lock mechanism 22 until, for example, the first DC voltage VDC1 detected from the control circuit 44 becomes a predetermined voltage value Vth or less. The lock mechanism 22 executes the lock while receiving the High signal. Here, when the first DC voltage VDC1 detected from the control circuit 44 becomes equal to or lower than the predetermined voltage value Vth, the voltage monitoring unit 68 switches the signal transmitted to the lock mechanism 22 from High to Low (release signal). The lock mechanism 22 releases the lock by receiving the release signal.

(Modification 1-2)
FIG. 5 is a circuit diagram of the electric circuit 42 of the modified example 1-2.

The injection molding machine 10 may include a plurality of locking mechanisms 22. In this case, as shown in FIG. 5, the electric circuit 42 may have a plurality of connection circuits 46 corresponding to each of the plurality of lock mechanisms 22. The number of lock mechanisms 22 shown in FIG. 5 is "2", but the number of lock mechanisms 22 in this modification is not limited to this.

The plurality of connection circuits 46 are connected to one control circuit 44 as shown in FIG. As a result, as in the first embodiment, the possibility that the operator comes into contact with the control panel 18 in which the voltage remains is reduced. Further, since the lock is performed by the plurality of lock mechanisms 22, the closed state of the cover 20 is maintained more firmly.

Modification 1-1 may be combined with this modification. That is, at least one of the plurality of connection circuits 46 may include a second converter 62, and the other connection circuits 46 may include a voltage monitoring unit 68 in place of the second converter 62.

[Second Embodiment]
The second embodiment will be described. The second embodiment relates to an "industrial machine control device (70)". In the second embodiment, the description of the elements to which the matters already described in the first embodiment can be applied may be omitted as appropriate.

FIG. 6 is a front view of the control device 70 of the industrial machine according to the second embodiment.

An industrial machine is, for example, a robot that performs work related to the production of an industrial product in a factory on behalf of a person or in collaboration with a person. In addition, machine tools such as cutting machines, wire electric discharge machines, and ultra-precision machines that produce industrial products by processing workpieces also fall under the category of industrial machines. The industrial machine executes the above-mentioned work and processing by supplying the drive voltage VAC2 from the control circuit 82 of the control panel 74, which will be described later.

The industrial machine control device 70 is a device that controls the industrial machine. Hereinafter, the “industrial machine control device 70” is also simply referred to as the “control device 70”. The control device 70 includes a housing 72, a control panel 74, a cover 76, and a lock mechanism 22.

The housing 72 is a box-shaped member. The housing 72 is provided with an opening 78. A control panel 74 is housed inside the housing 72. The control panel 74 is provided with a control circuit 82 necessary for controlling an industrial machine to be controlled by the control device 70.

The opening 78 is covered by a cover 76. With respect to the cover 76, the outline of the cover 20 described in the first embodiment can be applied within a range that does not cause a contradiction.

The lock mechanism 22 maintains (locks) the state when the cover 76 covers the opening 78. Since the outline of the lock mechanism 22 is described in the first embodiment, it is omitted here. In the present embodiment, the lock mechanism 22 locks and unlocks based on the voltage of the control panel 74 (control circuit 82) for controlling the industrial machine. This will be described later.

FIG. 7 is a circuit diagram of the electric circuit 80 of the second embodiment.

The control device 70 of the present embodiment further includes the electric circuit 80 shown in FIG. 7. The electric circuit 80 includes the control circuit 82 described above, and a connection circuit 84 that electrically connects the control circuit 82 (control panel 74) and the lock mechanism 22. “M” in FIG. 7 indicates a control target of the control circuit 82. "M" is an industrial machine in this embodiment.

As described above, the control circuit 82 is a circuit for controlling an industrial machine. The control circuit 82 includes a first converter 48, a first wire 50, a second wire 52, an inverter 54, and a capacitor 56. The outline of the control circuit 82 is the same as that of the control circuit 44 (FIG. 2) described in the first embodiment except that the drive voltage VAC2 is supplied to an industrial machine.

The connection circuit 84 includes a third wire 58, a fourth wire 60, a second converter 62, a resistance element 64, and a rectifying element 66. The outline of the connection circuit 84 is the same as that of the connection circuit 46 (FIG. 2) described in the first embodiment.

The outline of the operation of the lock mechanism 22 realized by the above electric circuit 80 is also the same as that of the first embodiment. That is, the lock mechanism 22 locks when the second DC voltage VDC2 is supplied to itself. Further, the lock mechanism 22 releases the lock when the second DC voltage VDC2 is no longer supplied to itself.

As described above, according to the present embodiment, there is provided a control device 70 for an industrial machine that reduces the possibility that an operator comes into contact with the control panel 74 in which the voltage remains.

(Modification 2-1)
Modifications 1-1 and 1-2 may also be applied to the second embodiment.
(Modification 2-2)
The second embodiment may also be applied to an injection molding machine. For example, in a certain injection molding machine (10), it is difficult to configure the accommodating portion (38) accommodating the control panel (18) from the base (16). In this case, by preparing the housing 72, the control panel (18) can be housed in the housing 72.

[Invention obtained from the embodiment]
The inventions that can be grasped from the first embodiment, the second embodiment, and the modifications described above are described below.

<First invention>
An injection molding machine (10) having a control panel (18) for controlling the injection molding machine (10) and an opening (40), and an accommodating portion (38) for accommodating the control panel (18). When the cover (20) covering the opening (40) and the cover (20) covering the opening (40) are locked and the voltage of the control panel (18) becomes equal to or lower than a predetermined voltage value. A lock mechanism (22) for releasing the lock is provided.

This provides an injection molding machine (10) that reduces the risk of an operator coming into contact with the control panel (18) in which the voltage remains.

The converter (48) further includes motors (M1 to M4) that are driven by supplying an AC voltage, and the control panel (18) converts the first AC voltage supplied from the power supply (P) into a DC voltage. And a capacitor (56) that smoothes the DC voltage, and an inverter that converts the smoothed DC voltage into a second AC voltage and supplies the second AC voltage to the motors (M1 to M4). The lock mechanism (22) may release the lock when the DC voltage becomes equal to or less than the predetermined voltage value. As a result, even after the power supply (P) is turned off, the lock is maintained as long as the discharge by the capacitor (56) continues.

A connection circuit (46) that supplies the DC voltage to the lock mechanism (22) may be further provided. As a result, the lock mechanism (22) can lock and unlock based on the DC voltage supplied from the control panel (18).

The lock mechanism (22) further includes a voltage monitoring unit (68) that detects the DC voltage and transmits a release signal to the lock mechanism (22) when the DC voltage is equal to or lower than the predetermined voltage value. The lock may be released when the release signal is received. As a result, the lock mechanism (22) locks and unlocks based on whether or not a release signal is transmitted from the voltage monitoring unit (68) even if it is not electrically connected to the control panel (18). Can be done.

A plurality of the locking mechanisms (22) may be provided. As a result, the closed state of the cover (20) is maintained more firmly.

The injection mechanism portion (12), the mold clamping mechanism portion (14), and the base (16) supporting at least one of the injection mechanism portion (12) and the mold clamping mechanism portion (14) are further provided. The accommodating portion (38) may be configured by the base (16). This eliminates the need to secure a space for installing the control panel (18) separately from the base (16).

<Second invention>
A control device (70) for an industrial machine, a control panel (74) for controlling the industrial machine, and a housing (72) provided with an opening (78) and accommodating the control panel (74). , The cover (76) covering the opening (78) and the cover (76) covering the opening (78) are locked, and locked when the voltage of the control panel (74) becomes equal to or less than a predetermined voltage value. It is provided with a lock mechanism (22) for releasing the above.

This provides a control device (70) for an industrial machine that reduces the risk of an operator coming into contact with the control panel (74) in which the voltage remains.

10 ... Injection molding machine 12 ... Injection mechanism 14 ... Mold clamping mechanism 16 ... Base 18, 74 ... Control panel 20, 76 ... Cover 22 ... Lock mechanism 38 ... Accommodating parts 40, 78 ... Openings 46, 84 ... Connection circuit 48 ... First converter (converter) 54 ... Inverter 56 ... Capacitor 68 ... Voltage monitoring unit 70 ... Control device 72 ... Housing M1 to M4 ... Motor

Claims (7)

It ’s an injection molding machine.
A control panel that controls the injection molding machine,
An accommodating portion provided with an opening and accommodating the control panel,
A cover that covers the opening and
A lock mechanism that locks the cover that covers the opening and releases the lock when the voltage of the control panel falls below a predetermined voltage value.
Equipped with an injection molding machine. The injection molding machine according to claim 1.
It is equipped with a motor that is driven by the supply of AC voltage.
The control panel converts the first AC voltage supplied from the power supply into a DC voltage, a capacitor that smoothes the DC voltage, and the smoothed DC voltage into a second AC voltage. It has an inverter that supplies the second AC voltage to the motor.
The lock mechanism is an injection molding machine that releases the lock when the DC voltage becomes equal to or lower than the predetermined voltage value. The injection molding machine according to claim 2.
An injection molding machine further comprising a connection circuit for supplying the DC voltage to the lock mechanism. The injection molding machine according to claim 2.
A voltage monitoring unit that detects the DC voltage and transmits a release signal to the lock mechanism when the DC voltage is equal to or lower than the predetermined voltage value is further provided.
The lock mechanism is an injection molding machine that releases the lock when the release signal is received. The injection molding machine according to any one of claims 1 to 4.
An injection molding machine having a plurality of the lock mechanisms. The injection molding machine according to any one of claims 1 to 5.
Further comprising an injection mechanism portion, a mold clamping mechanism portion, and a base for supporting at least one of the injection mechanism portion and the mold clamping mechanism portion.
An injection molding machine in which the accommodating portion is composed of the base. It is a control device for industrial machinery
A control panel that controls the industrial machine,
A housing provided with an opening and accommodating the control panel,
A cover that covers the opening and
A lock mechanism that locks the cover that covers the opening and releases the lock when the voltage of the control panel falls below a predetermined voltage value.
A control device for industrial machinery.

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